If the menstrual flow suddenly becomes low, you can take Yimoucao capsules orally to treat the effect of low menstrual flow, provided that pregnancy is excluded. Usually the menstrual flow will improve after taking the medicine, and it is recommended to take it for half a month continuously. If the menstrual flow is still reduced at the time of the next menstruation, then it is recommended to have a blood test for sex hormone six on the day after the menstruation, mainly to find out whether the ovarian function is normal, whether the amount of estradiol is normal, and whether there is hyperprolactinemia and hyperandrogenemia. Based on the results, clinical treatment will be given accordingly. In addition, during the menstrual period, if you suddenly suffer from cold stimulation, such as drinking a frozen drink will cause vasoconstriction, which will also lead to reduced menstruation. Therefore, it is not allowed to eat cold food during menstruation.